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Finding the Fourth Proportional to 830.60, 1,146.70 and 550.75

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Solution

The fourth proportional to 830.60, 1,146.70 and 550.75 is: 760.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.60 : 1,146.70 = 550.75 : x
  2. Step 2: Convert to fraction form
    830.60/1,146.70 = 550.75/x
  3. Step 3: Cross multiply
    830.60x = 1,146.70 × 550.75
  4. Step 4: Simplify right side
    830.60x = 631,545.03
  5. Step 5: Solve for x
    x = 631,545.03/830.60
  6. Step 6: Final answer
    x = 760.35

Related Problems

Find fourth proportional to 415.30, 573.35 and 275.38
Half scale
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Double scale
Find fourth proportional to 831.60, 1,148.08 and 551.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.